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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f635c1ed7e1862c34eadb71c45beddf28f4d571465fd4f6ffb291341aaffa557' 
  AND token = 'DJ3/Cz17Cgb1R2+y24SsLNBovI7+pNHE6jmIaLLpBJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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