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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1ef43d52c7b189d00a6619b5cdea18656619fa8fe66cf6d6e1c96980c15e053' 
  AND token = '5u8ERx4yZiZgpwwjmjtjjfkFUViNgCWvWRTF48aoRhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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