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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a12454b80caea16f0a82c64eda6cabb0ce65085408561858c6b0f8be5d5d1bef' 
  AND token = 'eFiFmoay/dlx+rIQTrVy5aTYQwQSB5vkHsp7f3IC580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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