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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cb17602dc39d12c1f3bfab8f5afb80153e53f1474824a82768aba9621686aa2' 
  AND token = 'Da43WvFw1CbSE6jpuPFFRTyBcUuiLKmBC2IqWt4+i7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}