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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1175103b66062d8ad2cd83e8c3ce9e3bbaa901ca72fa60e808188f9cc7eee080' 
  AND token = 'lLiJ0JE2COvPXw9l0plH+ZfyM47lkxv2J2Jtdzi/Iik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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