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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3b1c2547c03f419a67d6b188ac0b485d3b1aa357ef5e5bbb61292974fc45ada' 
  AND token = 'S7CIBm0FEn2zq+Ny7rQZT3NaFsZ+7exPh9gn5s6xCdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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