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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24ef617252bbe5444e890efcf6c24f93c0ddb9eaeabe32283cea564602866eb9' 
  AND token = 'ygttBj4Q+h3IVBWr9Fb8bv3mkTGLCN5XifwQP2dG/kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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