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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a856b561e421d8f094503b0f6a6e2ac0b13ea6fb42de9a5c8a818b6c14a40fa' 
  AND token = 'Qj9qg00oJzJdi7IFXFXpJ2IKIlQI6yJhG0MrR1vz5qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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