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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d554cecfc9fed7d6fd5f0e1c22b0e007d72cf81b4d74458355de53f693a59a' 
  AND token = 'GcxGoILTj1MFOvdaiaE5Tfx6uumSQ6rdydlOEmh8Qbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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