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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab03071d86707ed74ebab5c3bcd77761a47267b261c1a285b3ef2b3eadd16180' 
  AND token = 'feBUyOAcPMoStEweaFclT3GT2GLLQ0SZ8G5Hl3W8T24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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