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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf7e68e773592d2d0a8990e2758866f3274dd591a76c7fcf835be13b35ba273c' 
  AND token = 'wAGP39duZ3ixLRhiLwsRCiKEB9q5JqMlHC8Cen3SknM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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