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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67c1930b81b856aef9cea50f0ca2738a88a1cfd0bfb81a54a6ded8dc9dbd0fd1' 
  AND token = 'k/rnED8rfvFC6HyaHtm0whD5thB/M9TRWOzur9/Pyp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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