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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f344e754d386bf92a414b68cf4af7e4628e63c6abc219f1fb432ef3cb869f27' 
  AND token = 'R1pp8P5XYdr45vUgiH2JAMKyYcffC1qJ4bcbThtKjsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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