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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f921ed19a0e6ec43be7504a53377b5f17e6b42cc5b730c869feba634d48d7440' 
  AND token = 'GlzoInfk+tya4i+tMjQ7Kubi07habqwvCe8d0xFPbZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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