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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56606e57a41df26cd37e1c72e610b9b054c55086d52d7184be4cda0387d7c039' 
  AND token = 'gwHC9jrbM3D/HEnjRXFVDrbk4K5m+eW3VKd2w0R35qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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