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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7acdb8b23143dc516cfd5d0697eae84619887f1c969886c16b47651dede050ce' 
  AND token = 'jb45F3jzBaX2xmbWuz61uRNvA31YP0qb/kkRGPsUeTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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