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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75e09ac9987dcdd50d60fe88383c5bc05daa82aa22cc845f755f3754abe3b39b' 
  AND token = 'PMpSR62BIUhpN8Qw23Ow1Z07jXArkjF62q26xJpxC2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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