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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8814b47596018c8d5ee32e6336691045db1bc3a809af4f056a4c798606f4727d' 
  AND token = 'r9anFAafF/J46tECdHD1hkQ+jMa3Di3iXpn1rPtmSFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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