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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6fef5cbfc42e6c2415f912f5db7050077d1f6611eff5e72c7e88b95cf9737dd' 
  AND token = '4sk1JgRbcYq4oP0vKYG4g5tM1jtCYw5s4ymp/molSq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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