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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1d27baba694dfa7db26e6acfdbb56c465d944e742b69407c74c4ec6e85b947' 
  AND token = '57/vwD+lwUf6BFqN37VzFEMHqDpgiiMHt3UastitcDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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