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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e5bd620b060f3440bb64bcf44e7d9bf36e116e075d0222236864e992472f66a' 
  AND token = 'rn3AHHO+oDv7Ay422vYTrS78JlsRRrgD9A/6rm94DbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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