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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e12d4956e8778425228edcf4cea18eadd31627dce62fd89f1606690601d64f42' 
  AND token = 'Vsi1OAAYxYu72DgQkuDOnPGxew/JMTCODzYksQlw8ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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