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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '640570c78ec551f7e16c0caeb340fcb56a923d236098e627d6d3c703d5e85b11' 
  AND token = 'Ry+KO20PG/P60++s166Vb9bLroixsdRCq94DTxX0LNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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