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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0910870c5c4c42d48c9211ef9e9220b10d20e64289731b2570d0830691098059' 
  AND token = 'zm9CozXX+NBfDBF7rBPEPdqHM5ouf9r6F7288hW42tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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