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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2abe37b739373d6b705148f5e7ae5918fb90fde916ff96a7bd7ed8433d1abb2e' 
  AND token = '/bkcwdNB5KnKwIixn+XDexVBV4Fp1H3fZvQC3xiw9lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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