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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cd04509ba81a4b31684a15c3e05e42a22215b944f1ff3e4b13622d54732cff6' 
  AND token = 'lHw7EXKeS6kd8Az2IXRrSHREnp+0awY45f6rRWYsWZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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