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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a27cc45c94ebb71ced46d58f688765248057db47037cc3f3afc914c79c64bed' 
  AND token = 'cVD1FgFD36MfTOrG/wLEBnUbcB0LmfNRUescfTQ/s0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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