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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aece4d64816181bebc2242d71753e41a5bdd9a36ec6cfae5aa46ce0e8c951f50' 
  AND token = '575c5QaBb2elwBNwP2J7oDDXe6Ee6Q3CjVyhUIjYTgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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