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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a626de9ab5e90a7560aea4d0045c2042187cc30674a3ebe2e6d7d882d4519a11' 
  AND token = 'WbywMVeSv3Q3KjVzPXk5uSsYeP96juRmQ8prRWWH4SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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