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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af62911bc25b13cacfaec209cf11bfcaa69439374bbdeb84a0028cce7f682ef8' 
  AND token = '+TjmC6uAMg2e+1A+OAXIIHhLhrRBE1UU7jj66glQhF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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