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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17de2914e18a2baf24bf128ea8aca2abc7707ae20cd52bb1d61f07ae99f18829' 
  AND token = '/6s2s+9q8p7KoLcO4yxeQFZbjNavLONpRtxAZ6fTGyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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