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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2afafa66048a8cd60194e7ddf234317b5d22388ddeb9c0e06f51d0438656e0b' 
  AND token = 'f2h5tehOZqYgKTJvT+ppaatcxaEHjAuMuFGFiMrI2rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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