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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8a9e51475fdc632b70e662ef1b9b3fdaf479bc735d2866aa8ee65f76d83ddfd' 
  AND token = 'f04cSUlNjohgkRe4GkZlMj1Il+chpsD6ciuo95f2FWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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