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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26ef74f5a63f2c195257d124dc055223bfaf0b11f89d2e29569b0a90cc6589a6' 
  AND token = 'DAF4rpw65sUA2j/tcLps+U1RUzXPbPqpqaekuwwAEKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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